21431454552 has 64 divisors (see below), whose sum is σ = 60420393600. Its totient is φ = 7037189280.

The previous prime is 21431454511. The next prime is 21431454553. The reversal of 21431454552 is 25545413412.

21431454552 is a `hidden beast` number, since 2 + 1 + 43 + 14 + 54 + 552 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431454553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 725974 + ... + 754917.

It is an arithmetic number, because the mean of its divisors is an integer number (944068650).

Almost surely, 2^21431454552 is an apocalyptic number.

It is an amenable number.

21431454552 is an abundant number, since it is smaller than the sum of its proper divisors (38988939048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21431454552 is a wasteful number, since it uses less digits than its factorization.

21431454552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480973 (or 1480963 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

Adding to 21431454552 its reverse (25545413412), we get a palindrome (46976867964).

The spelling of 21431454552 in words is "twenty-one billion, four hundred thirty-one million, four hundred fifty-four thousand, five hundred fifty-two".